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People are getting around 250 MB/s from an SSD on the PCIe (M.2) on VisionFive 2. Ok, so you'd ideally like 400 MB/s from 1 lane, but it's still 10x better than
by brucehoult 4y ago
People are getting around 250 MB/s from an SSD on the PCIe (M.2) on VisionFive 2. Ok, so you'd ideally like 400 MB/s from 1 lane, but it's still 10x better than SD card.
It's probably being limited because the RAM to RAM copy speed isn't much more than that! I get 475 MB/s memcpy() speed for 64 MB copies on my VisionFive 2. The much slower CPU on the AllWinner D1 manages 1100 MB/s n the same code. Somehow the SiFive-based SoCs have never been good on RAM speed -- the HiFive Unleashed and Unmatched were even worse than this.
Hopefully the Horse Creek SoC has some good Intel DDR IP in it.
- FullyFunctional 4y agoI'm getting ~ 180 MB/s on a Samsung SM8?? which hits around 3 GB/s on a desktop. I'm using a 5.1V 3.5A supply so that ought not be the issue (but I'll try another PSU now). Horse Creek would be nice - should it ever become available for purchase. EDIT: Well, I'm shocked. With a far more beefy supply (12.3V/0.7A) I now hit 295+ MB/s, not great but so much better than before. Thanks for the hint.
- deleted 4y ago[deleted]
- brucehoult 4y agoInteresting data, thanks!
- FullyFunctional 4y agoNobody called me on my nonsense so I will: The 5.1V 3.5A = 17.8W was the PSU _rating_ whereas the 12.1V 0.7A = 8.5 W was actually _meassured_. I’m not a EE and I don’t understand the power section of that board, but something to look out for.
- brucehoult 4y agoYes, it didn't seem to make sense butI figured it was a typo and the more important thing was the increased SSD speed. What is the rating of your bigger supply? And presumably what you were measuring is the average Amps/Watts, not the peak.
- FullyFunctional 4y agoExactly. The bigger supply is the (excellent) https://pine64.com/product/pinepower-120w-desktop-power-supply-us-version/ https://pine64.com/product/pinepower-120w-desktop-power-supp... and the output I used is rated as: 65W Output/5V3A, 9V3A, 12V3A, 15V3A, 20V3.25A